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the weighed arithmetic mean of the numbers 1,2,3,4,......,10,the weights being the corresponding numbers is
Dear sri
Solution:
waighed airthmatic mean = [ 1*1 + 2*2 + 3*3 + ...........+10*10] / [1+2+3 + .....10]
=[10(10+1)(20+1)/6 ] / [10(10+1)/2]
=7
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